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<div style="position: absolute"> <div style="position: relative; z-index: 400; border: solid 1px red; width: 2em; margin: -2px; background: gold;" data-bind="style: { top: viewportFrom, height: viewportHeight }, click: function() { alert(viewportFrom()+' '+viewportHeight()) }"> </div></div>​<!-- ko foreach: lines --><div class=teapo-scroller-line data-bind="style: { width: lineWidth, height: $parent.lineHeight }"></div>​<!-- /ko -->